Guard empty OpenAL capture buffers

gumble/go-openal/openal/alcCore.go

@@ -167,6 +167,9 @@ return nil
 }
 
 func (self *Device) GetIntegerv(param uint32, size uint32) (result []int32) {
+	if size == 0 {
+		return []int32{}
+	}
 	result = make([]int32, size)
 	C.walcGetIntegerv(self.cHandle(), C.ALCenum(param), C.ALCsizei(size), unsafe.Pointer(&result[0]))
 	return
@@ -213,10 +216,16 @@ func (self *CaptureDevice) CaptureStop() {
 }
 
 func (self *CaptureDevice) CaptureTo(data []byte) {
+	if len(data) == 0 {
+		return
+	}
 	C.alcCaptureSamples(self.cHandle(), unsafe.Pointer(&data[0]), C.ALCsizei(uint32(len(data))/self.sampleSize))
 }
 
 func (self *CaptureDevice) CaptureToInt16(data []int16) {
+	if len(data) == 0 {
+		return
+	}
 	C.alcCaptureSamples(self.cHandle(), unsafe.Pointer(&data[0]), C.ALCsizei(uint32(len(data))*2/self.sampleSize))
 }
 
@@ -229,10 +238,16 @@ func (self *CaptureDevice) CaptureMono16To(data []int16) {
 }
 
 func (self *CaptureDevice) CaptureStereo8To(data [][2]byte) {
+	if len(data) == 0 {
+		return
+	}
 	C.alcCaptureSamples(self.cHandle(), unsafe.Pointer(&data[0]), C.ALCsizei(uint32(len(data))*2/self.sampleSize))
 }
 
 func (self *CaptureDevice) CaptureStereo16To(data [][2]int16) {
+	if len(data) == 0 {
+		return
+	}
 	C.alcCaptureSamples(self.cHandle(), unsafe.Pointer(&data[0]), C.ALCsizei(uint32(len(data))*4/self.sampleSize))
 }
 

gumble/go-openal/openal/openal_test.go

@@ -45,6 +45,15 @@ func TestEmptySliceAPIsDoNotPanic(t *testing.T) {
 	source.Getiv(0, nil)
 	source.QueueBuffers(nil)
 	source.UnqueueBuffers(nil)
+	var device openal.Device
+	if got := device.GetIntegerv(0, 0); len(got) != 0 {
+		t.Fatalf("got %d integers", len(got))
+	}
+	var capture openal.CaptureDevice
+	capture.CaptureTo(nil)
+	capture.CaptureToInt16(nil)
+	capture.CaptureStereo8To(nil)
+	capture.CaptureStereo16To(nil)
 	var listener openal.Listener
 	listener.Setfv(0, nil)
 	listener.Setiv(0, nil)